The study thoroughly reviews the laws, regulations and policies of the Chinese government on rural renewable energy development and farmland management, and analyzes the economic benefits of various technologies to assess the additionally of CDM projects in household biogas and conservation tillage. Through study tours and surveys, the authors collected statistical data on household biogas production and distribution, fossil fuel replacement, and conservation tillage development and distribution of technologies to determine and explore the baselines. Approved CDM methodologies and their applicability were collected by the authors to develop methodology guidelines. The study also estimated the emission reduction potentials of CDM projects through case studies.